TOKYO - Oil refiner Idemitsu Kosan Co. will supply about 4 million barrels of crude oil to Vietnam at the request of the Japanese government, sources familiar with the matter said Wednesday.

Vietnam, a key exporter of petroleum-derived industrial parts to Japan, relies heavily on the Middle East for energy supplies like other Southeast Asian countries. Their oil procurement remains disrupted after the Strait of Hormuz was largely blocked following the U.S.-Israeli attacks on Iran.

Related coverage: